let's do some science. let's do some science. ♪ music ] ♪ music ] >> hi, guy, welcome back to >> hi, guy, welcome back to "techknow." "techknow." i'm phil torres, with rochelle, i'm phil torres, with rochelle, kyle and lindsay. kyle and lindsay. kyle, the nfl paid over kyle, the nfl paid over three-quarters of a million to three-quarters of a million to settle a lawsuit. settle a lawsuit. what was it about. what was it about. >> there's a focus on the >> there's a focus on the concussion problem. concussion problem. the nfl has thousands of place, the nfl has thousands of place, and millions of players in youth and millions of players in youth and challenge football. and challenge football. i went to virginia tech to look i went to virginia tech to look at technology to test helmets at technology to test helmets and track hits on college and and track hits on college and youth players. youth players. let's take a look. let's take a look. . . >>> homecoming in the >>> homecoming in the heartland. heartla